/// 测试循环loop
pub fn test() {
    let mut b1 = 1;

    'outer_loop: loop {
        let mut b2 = 1;

        loop {
            println!("Current value: [{}][{}]", b1, b2);

            if b1 == 2 && b2 == 2 {
                break 'outer_loop;
            } else if b2 == 5 {
                break;
            }

            b2 += 1;
        }

        b1 += 1;
    }
}
